Definition of "sumac" [su•mac]

• Any of various shrubs or small trees of the genus Rhus, having compound leaves, clusters of small greenish flowers, and usually red, hairy fruit. Some species, such as the poison ivy and poison oak, cause an acute itching rash on contact. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The offending material in all species of poison ivy, poison oak and poison sumac is an oily resin known as urushiol."
• "The irritant in all species of poison ivy, poison oak and poison sumac is an oily resin known as toxicodendrol."
• "In Anchorage, sumac is available at Sagaya and City Market."